chr15-42745808-T-G

Position:

chr15-42745808-T-G

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_ModerateBS1_SupportingBS2

The NM_173500.4(TTBK2):c.3722A>C(p.Lys1241Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000273 in 1,614,018 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00029 ( 0 hom. )

Consequence

TTBK2
NM_173500.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 5.65

Variant links:

Genes affected

TTBK2 (HGNC:19141): (tau tubulin kinase 2) This gene encodes a serine-threonine kinase that putatively phosphorylates tau and tubulin proteins. Mutations in this gene cause spinocerebellar ataxia type 11 (SCA11); a neurodegenerative disease characterized by progressive ataxia and atrophy of the cerebellum and brainstem. [provided by RefSeq, Aug 2009]

TTBK2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -7 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.18443385).

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.00029 (424/1461818) while in subpopulation NFE AF= 0.000365 (406/1112012). AF 95% confidence interval is 0.000336. There are 0 homozygotes in gnomad4_exome. There are 199 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 17 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TTBK2	NM_173500.4 linkuse as main transcript	c.3722A>C	p.Lys1241Thr	missense_variant	15/15	ENST00000267890.11	NP_775771.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TTBK2	ENST00000267890.11 linkuse as main transcript	c.3722A>C	p.Lys1241Thr	missense_variant	15/15	5	NM_173500.4	ENSP00000267890	P1	Q6IQ55-1

Frequencies

GnomAD3 genomes

AF:

0.000112

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000206

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000108

AC:

AN:

249570

Hom.:

AF XY:

0.000103

AC XY:

AN XY:

135400

show subpopulations

Gnomad AFR exome

AF:

0.0000646

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000221

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.000290

AC:

424

AN:

1461818

Hom.:

Cov.:

AF XY:

0.000274

AC XY:

199

AN XY:

727202

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000365

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.000112

AC:

AN:

152200

Hom.:

Cov.:

AF XY:

0.0000941

AC XY:

AN XY:

74360

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000206

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000245

Hom.:

Bravo

AF:

0.000155

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000241

AC:

ExAC

AF:

0.0000579

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Sep 30, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jan 02, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 24, 2023	This variant is present in population databases (rs36104367, gnomAD 0.02%). ClinVar contains an entry for this variant (Variation ID: 425066). This variant has not been reported in the literature in individuals affected with TTBK2-related conditions. This sequence change replaces lysine, which is basic and polar, with threonine, which is neutral and polar, at codon 1241 of the TTBK2 protein (p.Lys1241Thr). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Spinocerebellar ataxia type 11

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.32

BayesDel_addAF

Benign

-0.17

BayesDel_noAF

Benign

-0.20

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.14

T;T

Eigen

Uncertain

0.63

Eigen_PC

Uncertain

0.63

FATHMM_MKL

Uncertain

0.95

LIST_S2

Benign

0.85

T;T

M_CAP

Benign

0.055

MetaRNN

Benign

0.18

T;T

MetaSVM

Benign

-0.53

MutationAssessor

Benign

1.7

L;.

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.65

PROVEAN

Benign

-1.2

N;.

REVEL

Benign

0.20

Sift

Pathogenic

0.0

D;.

Sift4G

Uncertain

0.042

D;D

Polyphen

1.0

D;.

Vest4

0.56

MVP

0.20

MPC

0.95

ClinPred

0.19

GERP RS

5.2

Varity_R

0.47

gMVP

0.39

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over